fix(party-mode): Use displayName field instead of name in agent output

CRITICAL BUG FIX: Party mode was showing agent identifiers like
"Analyst", "Architect", "Dev" instead of actual persona names like
"Mary", "Winston", "Amelia" due to incorrect field references.

Changes:
- step-01-agent-loading.md: Use [displayName] not [Agent Name]
- step-02-discussion-orchestration.md: Use [displayName] not [Agent Name]
- Added CRITICAL warnings to use displayName field from manifest CSV

This ensures agents appear with their proper persona names throughout
party mode conversations and TTS announcements.

Resolves AgentVibes test31/test32 user feedback where all agents
showed generic title-cased identifiers instead of personas.

src/core/workflows/party-mode/steps/step-01-agent-loading.md

@@ -79,12 +79,14 @@ Welcome {{user_name}}! I'm excited to facilitate an incredible multi-agent discu
 
 [Display 3-4 diverse agents to showcase variety]:
 
-- [Icon Emoji] **[Agent Name]** ([Title]): [Brief role description]
-- [Icon Emoji] **[Agent Name]** ([Title]): [Brief role description]
-- [Icon Emoji] **[Agent Name]** ([Title]): [Brief role description]
+- [icon] **[displayName]** ([title]): [role]
+- [icon] **[displayName]** ([title]): [role]
+- [icon] **[displayName]** ([title]): [role]
 
 **[Total Count] agents** are ready to contribute their expertise!
 
+**CRITICAL:** Use the `displayName` field from the manifest CSV (e.g., "Mary", "Winston", "Amelia"), NOT the `name` field (e.g., "analyst", "architect", "dev").
+
 **What would you like to discuss with the team today?**"
 
 ### 5. Present Continue Option

src/core/workflows/party-mode/steps/step-02-discussion-orchestration.md

@@ -73,9 +73,11 @@ Generate authentic responses for each selected agent:
 **Response Structure:**
 [For each selected agent]:
 
-"[Icon Emoji] **[Agent Name]**: [Authentic in-character response]
+"[icon] **[displayName]**: [Authentic in-character response]
 
-[Bash: .claude/hooks/bmad-speak.sh \"[Agent Name]\" \"[Their response]\"]"
+[Bash: .claude/hooks/bmad-speak.sh \"[displayName]\" \"[Their response]\"]"
+
+**CRITICAL:** Use the `displayName` field from the manifest (e.g., "Mary", "Winston", "Amelia"), NOT the `name` field.
 
 ### 4. Natural Cross-Talk Integration